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STW4811MBRA/LF 数据表(PDF) 49 Page - STMicroelectronics

部件名 STW4811MBRA/LF
功能描述  Power management for multimedia processors
PDF  86 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STW4811MBRA/LF 数据表(HTML) 49 Page - STMicroelectronics

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Functional description
STw4811M/STw4811N
48/85
4.4.2
Modes and operations
Power modes
The transceiver power modes are:
●
active mode
●
suspend mode
●
power down mode
In suspend mode the differential transmitter and receiver are turned off to save power but
the USB interface is still active (pull-up and pull-down on, VBUS on).
In power down mode, only the serial interface is active and the transceiver is able to detect
SRP. In power down mode, ID ball can be grounded by ‘id_gnd’ bit of
USB control register 2
(
Table 12).
USB modes
The two transceiver modes are:
●
DAT_SEO mode (dat_se0 = 1 in
USB control register 1 - Table 11)
●
VP_VM mode (dat_se0 = 0 in
USB control register 1 - Table 11)
Data transmission The transceiver transmits USB data in the following conditions for
USB
control register 1
(Table 32, Table 33):
uart_en=0; oe_int_en=0
and USBOEn ball at low level.
Table 32.
Data transmission via USB control register 1 (DAT_SE0 mode) - Suspend = 0
USB mode
(DAT_SE0)
Inputs
Outputs
Comments
USBVP
USBVM
DP
DN
USBRCV
1 (DAT_SE0 mode)
0
0
0
1
Not used
Single ended data (zero sent)
1 (DAT_SE0 mode)
1
0
1
0
Not used
Single ended data (1 sent)
1 (DAT_SE0 mode)
x
1
0
0
Not used
Force single ended zero
0 (VP_VM mode)
0
0
0
0
DIFF_RX
DAT_VP drives the level of DP
SE0_VM drives the level of DN
0 (VP_VM mode)
1
0
1
0
DIFF_RX
0 (VP_VM mode)
0
1
0
1
DIFF_RX
0 (VP_VM mode)
1
1
1
1
DIFF_RX



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